Register



1.959 A. o. HOGBERG ET AL 2,869,625

REGISTER Filed March 18, 1954 3 Sheets-Sheet 1 :yll

INVENTOR flKE' O. HOGBERG HLfiN C. Alf/L30 ATTORNEY Jan. 20, 1 959 A. o. HOGBERG .ET AL 2, 9, 2

REGISTER Filed March 18, 1954 s Shee ts-Sheet 2 INVENTOR AK: 0. H0 BERG Jan. 20, 1959 A. o. HOGBERG ET AL 2,869,625

REGISTER 3 Sheets-Sheet 3 Filed March 18, 1954 INVENTOR HR: 0. HOG-BERG Hui/v C. M274 SON ww ATTCSRNEY United States Patent REGISTER Ake 0. Hogherg, Worcester, and Alan C. Neilson, Greenfield, Mass, assignors to Riley Stoker Corporation, Worcester, Mass, a corporation of Massachusetts Application March 18, 1954, Serial No. 417,184 2 Claims. c1. 158-1.5)

This invention relates to registers and more particularly to apparatus for regulating the supply of air flowing to a burner.

It is common practice in the art of generating steam to supply heat to a combustion chamber by means of a burner projecting through an aperture in the combustion chamber Wall. Whether this burner be arranged for burning fuel oil, pulverized coal, or gas, it is usually of elongated tubular construction, one end of the tube lying in an opening in the combustion chamber wall and the other end of the tube extending away from the furnace wall on the outer surface thereof. Secondary combustion air is supplied from an air chamber or plenum which surrounds the tubular burner, the air chamber being supplied with preheated air by means of a fan and an air heater associated with the steam generating apparatus. In the prior art there were usually two means provided for controlling air flow to the burners. A primary damper in the duct leading to the air chamber was used to control the amount of air flowing to the individual burner. Secondary dampers surrounding the burner and situated in the air chamber are used to direct the air into proper relationship to the tubular burner for proper mixing with the fuel. In multiple burner installations, Where a large number of burners are installed in one wall, there are disadvantages to using an individual duct and damper and air chamber for each burner, so it is usual to use a common chamber which envelopes all the burners in such an installation. In such a case the primary dampers, for obvious reasons, are eliminated and their task of shutting off air is passed onto the secondary air vanes. Another situation in which problems arise is where numerous registers are situated in a common duct and the air enters from one direction. It can be readily seen that an unbalanced condition could result among registers where the pressure might not be distributed evenly among registers and around each registers circumference. These and other difficulties experienced with the prior art are obviated by the present invention.

It is therefore an outstanding object of the present invention to provide a register which will improve the operational characteristics of a burner for use with a steam generating unit.

Another object of the invention is to provide a register in which the secondary air ducts are simplified and in which air may be brought to the front of the boiler, either at the bottom or the top, or both sides, without the necessity of running individual ducts to the outer ends of the burners of a group.

It is another object of this invention to provide a register in which the construction is such as to simplify the air ducts and to assure more nearly equal air distribution among several burners.

A still further object of the instant invention is the provision of a register which will provide a better flame shape due to the air entering evenly around the burner throat.

ICC

It is another object of the invention to provide a reg ister which brings about a greater rotation of secondary air.

It is a further object of this invention to provide a register which will permit an increased insulation of the burner front plate over that of the prior art.

A still further object of this invention is theprovision of a burner register incorporating a unique mechanism which permits opening certain blade or blades more than others, at the same time permitting all blades to close tightly.

To the accomplishment of the foregoing and related ends, the invention, then, comprises the features hereinafter fully described and particularly pointed out in the claims, the following description and annexed drawings setting forth in detail certain illustrative embodiments of the invention, these being indicative, however, of but a few of the various ways in which the principle of the invention may be employed.

In said annexed drawings:

Figure 1 is a perspective view of the register of the invention,

Figure 2 is a perspective view of the register as viewed from the furnace end thereof,

Figure 3 is a vertical, sectional view of the register of the invention in use with a fuel burner and showing a portion of the furnace wall,

Figure 4 is an enlarged elevation view of a portion of the register, and

Figures 5, 6 and 7 are more or less schematic views showing the register in various positions of operation.

Like reference characters denote similar parts in the several figures of the drawings.

Referring to Figures 1 and 2, wherein are best shown the general features of the invention, the register, desig nated generally by the reference numeral 10, is shown as having a large, square front plate 11, the rearward surface of which is provided with a thick layer of insulation 12. Parallel to and spaced from the front plate 11 is a circular center plate 13. While still further spaced and parallel to the front plate is a circular rear plate 14. Joining the three plates and holding them in their fixed spaced positions are spacer rods 15. These spacer rods are arranged in a cylindrical configuration adjacent the outer peripheries of the center and rear plates 13 and 14. A similar series of control rods 16 extend between and through the front plate 11 and the center plate 13. Each control rod extends through the center plate 13 and into the space between the center plate and the rear plate and is attached by welding or otherwise to a secondary air vane 17.

Extending between and through the front plate and the center plate is a series of observation tubes 18. The end of each tube which extends forwardly of the front plate is provided with a cover 19. Mounted on the side of the front plate which faces away from the furnace is a register control mechanism 2ft comprising an operating ring 21 mounted for rotation about its center in rollers 22. To the other end of each of the control rods 16,

as it extends through the front plate 11, is clamped an t actuating arm 23, the other end of which is pivotally attached to one end of a link 24. The other end of the link 24 is pivotally attached to the operating ring 21. A segment 25 of a circular rack is attached to the operating ring and extends along the periphery thereof. The rack segment 25 is engaged by a pinion gear 26 rotatably carried by the front plate and actuated by a crank handle Referring to Figure 3 it can be seen that the front plate, center plate, and the rear plate are provided with aligned, centrally-located apertures through which extends a burner tube 28. In this view the register contier-2h isomitted'for'the sake of simplicity. The furnace'end of-the burner'tube' extends into an opening in" the furnace Wall 29 and is surrounded with a burner tile provided with a suitably formed opening 31. The rear plat-e14: of the register is interlocked with the burner tile 30 by means-of a retaining ring 32'which en: gages suitable conformations on the. outer side of the tile-30. The outerend of the burner tube'ZS'is provided with a fuel-receiving housing 33 which is provided with an entrance passage 3 for attachment to a fuel duct, not shown; The usual fuel distributing vanes are provided, these being arranged concentrically with the centerline of the burner tube 28. A pilot torch '36 extends through the housing 33 concentrically with the burner tube 28 and extends to the inner end of the said tubewhere his supported by a coal spreader 37. The burner shown in-the drawing is intended for use with pulverizedcoal. Of course, any type of burner could besubstituted for this particular burner.

In Figure 4 the details of the register control mechanism 29 can be-seen with greater clarity. It should be observed, for instance, that the actuating arms 23 are each composed of a large portion 35 and a smaller portion 39 joined by cap screws to, each of the portions being provided at their adjacent surfaces with cylindrical recesses which embrace and engage the extending end of the control rods 16. Each link overlies and is pivotally attached by means of a pin 41 to that end of the actuating arm 38" which isnot clamped around the extending end of a control rod 116. The other end of each of. the links 24 is pivotally attached to the operating ring'zl by means of cap screw 42. The cap screw'42 may be screwed into any one of a series of threaded apertures- 43 'in the'operating ring 21. The threaded apertures 43 are arranged in a circle concentric with the center-of the operating ring and a selection is available of any one of several positions at each link 24. The pinion gear 26 is mounted on a shaft the inner end of-which'is fixedly held by welding or otherwise to a plate 45. The plate 4% is provided with slots 46 through" which extend cap screws 3?, these cap screws being threadedly engaged with the front plate 11. The plate maythus be moved inwardly and outwardly radially from the center of the operating ring 21. The outer end o'f' the shaft 44 is threaded and a locking knob 4-3 is threaded thereon. The pinion gear 2-6 and the crank handle'27 are mounted on the shaft 44 and although they are keyed against rotation relative thereto, a certain amount of axial sliding is permitted, thus it is possible by unscrewing the locking knob to reicase'the handle 27 and the gear 26.

The operation of the invention will now be understood in view of the above description. The fuel, which'in this case is pulverized coal, is carried by means of primary air through the housing 33 and is distributed by'thevanes' 35 and passes axially through the burner tube 28. At the inner end of the burner tube the fuel and air is projected outwardly into the furnace in a conical conformation Where it is ignited by means of the pilot torch 36'. Preheated secondary air is admitted to the air chamber or plenum and surrounds the more or less cylindrical space in the register defined by the center plate 13 and the secondary air vanes 17 Movement of the vanes 17 from closed position to an open position permitsthe air to flow by the vanes to the space surrounding the inner end of the burner tube 2.8. The air then flows toward 20 The air in the air chamber or plenum isusually' moirin'gin a liuealldirection. Thisdirecti'on is'away'from' the point where the air duct from the air preheater enters all about the periphery of the register, the register will permit a considerably larger amount of air to enter on the windward side thereof than enters on the lee side. This results, of course, in an uneven flame and a flame in which a part, at least, is not operating under optimum combastion circumstances. To even out this pressure and volume distribution of air, a feature, which may be called bias control, has been incorporated into the register. This allows unequal angular displacement of the secondary air vanes, those vanes onthe lee side of the register usually being opened more than the vanes on the wind- Ward side. This'control still permits sealing off of the dampers at someone position of the operating handle and also allows selection of either clockwise or counterclockwise rotation of air through the register merely by turning the operating handle. Once the operating mechanism' has been adjusted, no further changes are necessary to allow bias control'of secondary air and choice of either rotation of secondary air.

Referring to'Figu're' 4 it can be seen that actuation of the crank handle Z'Tmoves the shaft 44 and actuates in turn thepiniongearZG. The gear 26 is in engagement with th'erack segment 25 and thus moves the operating.

to theend of the actuating arm 33, the inner end of thelinlc 24 is forced tomove radially. This radial movement of the point of connection between the link 24and the actuating arm -38"results in an angular rotation of the actuating arm SSabouttltc center of the control rod 16. This, in'turn; results ina rotation ofthe control rod and of the vanes 17 Which'ar'e attached thereto. It is possible by actuation of the handle 27 to rotate each of the vanes 17as 'a"body'about the axis of'its control rod 16; i

In Figure 5 can be seen the condition of the apparatus when the vanes 17' are closed; that is to say, when the contiguous edges of adjacent vanes are touching- An indicating arrow 49' may be mounted on the operating ring while a scalcStl may be mounted'on the front plate for reading the"pos'iti'onsof theva'nc's at any given time, in Figure 6 canbeseen the condition of the vanes at one extremesettingof the mechanism; in this position the vanes are set to cause counterclockwiserotation of the secondary air entering the register, while in Figure 7' the vanes have beenset for clockwise rotation of the second aryair. No attempt has been made to show some of the vanes'more' closed than others as'would be proper in a practical setupl However, this adjustment may of course be made.

lf'it is found necessary to admit more air through one segment'of there'gister, one should move the links of those vanes through which more air is desired one hole in-the'counterclockwise direction on the operating ring. If even more bias is desired, the links of those vanes through whichlessairis desired should be moved clockwise one .hole on the operating ring. irrespectiveof the adjustmentswhich are made to admit more'airin 'oneseg'rn'ent ofregister than in another segment, the vanesfwill all arrive at closed position at the samepointinthe rotation of the crank handle 2'7.

Other'modesof applying'the principle of the invention may be employed, change being made as regards the details described, provided the features stated in the folenclosure";.control rodseach connected at one end to a, vanefor the actuation thereof, the other endsof'the rodt.

it can be seen that being arranged in a circle, an annular positioning ring concentric with the rod circle means for rotating the ring about its center, a series of links each pivotly connected at one end to the ring, a series of actuating arms each fixedly connected at one end to a control rod, the other end of each link being pivotly connected to the other end of an arm, each control rod and the pivotal connection of its respective linkage to the positioning ring being on a line radial of the ring when the vane is in its intermediate position, the annular positioning ring being larger than the rod circle and lying outside the rod circle, whereby the vanes may be moved through 180 from closed position to closed position.

2. A register comprising a front plate, a center plate, and a rear plate arranged in spaced parallel relationship, control rods extending through the front and center plates and arranged in parallel relationship to define a cylinder, an air vane associated with each control rod, the air vanes residing between the center and rear plates and forming a polygonal enclosure therewith, an annular positioning ring rotatably mounted on the front plate and. being concentric with the circle formed by the ends of the rods extending through the front plate, a gear segment attached to the ring, a gear engaging the segment, a crank connected to the gear to rotate it and thus to rotate the positioning ring, a serial of linkages each pivotly connected at one end to the ring, each control rod and the pivotal connection of its respective linkage to the positioning ring being on a line radial of the ring when the vane is in its intermediate position, an actuating arm adjacent each link fixedly clamped at one end to a control rod, the other end of each link being .rotatably connected to the other end of its adjacent arm, and means for individually adjusting the pivotal connection of each link to the ring along the ring to permit bias control of the vanes while permitting complete closure thereof, the annular positioning ring being larger than the rod circle and lying outside the rod circle whereby the vanes may be moved through 180 from closed position to closed position.

References Cited in the file of this patent UNITED STATES PATENTS 1,513,278 Sadtler Oct. 28, 1924 1,655,246 Schermuly Jan. 3, 1928 1,697,568 Korn Jan. 1, 1929 1,795,454 Van Brunt Mar. 10, 1931 2,211,684 Baker Aug. 13, 1940 2,439,554 Anderson Apr. 13, 1948 

